there's a reason proton moved from denso to sanden and perodua on the other hand moved to denso

the 3 honest a/c aircond i went always recommend coming back every year for regular service...not major service
they even has a sticker for it...not just words of mouth

simply use common sense, if your house a/c also service every year...why won't your car?

u forgot your home a/c is stationary, you car's a/c is moving
gone through heat, dirt, leaves, rain, water puddle and car wash....but people still refuse to service it until some parts actually fail

thn blame the brand for being unreliable or shops trying to scam people
so it's not really about just the air it's sucking in...it's what the parts went through